A warning that federal tax officials will need more congressional funding to administer the Democrats’ health reform law has rekindled the partisan debate over its cost effectiveness.

Senior Republicans have said for months that the new responsibilities required of the Internal Revenue Service (IRS) under the legislation would saddle the agency with billions of dollars in additional costs — expenses not accounted for in the bill.

A Wednesday report from the National Taxpayer Advocate (NTA), an independent watchdog within the IRS, backed those claims, finding that the agency currently lacks the resources to take on the new duties.

“I have no doubt the IRS is capable of administering social programs, including healthcare,” Nina Olson, head of the NTA, said in a statement. “But Congress must provide sufficient funding.”

Republicans quickly offered up a message to Democrats that boiled down to this: We told you so.

“Before ObamaCare passed, [Minority Leader John Boehner] and others warned that it would require an army of new IRS agents,” Boehner (R-Ohio) spokesman Michael Steel said in an email. “Democrats denied it. Now we know the truth.”